The user said: "Yesterday my sister came home absolutely livid at the sight of a set of posters her school had been putting out. Since then she's been absolutely amazing, and has been in contact with school officials, local papers..

"I'm so proud of her and all she's done, and I just wanted to share this crazy situation."

A statement from the Manitowoc Public School District read: "The poster postings which have become the center of controversy did not promote any religious theme or institution and were not religious in content. Posters have been utilized for a number of years and, like past years' messages, this poster was one of several merely intending to promote a positive prom experience.

"No particular religious standard or expectation was being promoted. Social media reaction has demonstrated that any message can be interpreted in a wide variety of ways, many never contemplated or intended to be part of the original message."